Irrigating trees and shrubs during summer drought
Statistically, most of the Midwest receives sufficient precipitation during the average year to prevent undue stress to plants. However, precipitation is not distributed evenly during the growing season. In most years, stress during midsummer drought conditions causes significant mortality of newly planted trees and shrubs and reduces growth and aesthetic appeal of established landscape plants. In years when drought conditions are more prolonged, homeowners look to rescue measures to protect trees and shrubs, their largest landscape investment.
Archive version. For the most recent information see extension.missouri.edu.